Microstructural Evolution of Ultra Fine Grained C-Mn Steel Warm Rolling and Intercritical Annea
AUTOR(ES)
Brzuszek, R.K., Rodrigues, P.C.M., Motta, L.S., Santos, D.B.
FONTE
Materials Research
DATA DE PUBLICAÇÃO
2002-09
RESUMO
The attainment of finer ferrite grain structure in low carbon is object of interest because significantly higher yield strengths and lower ductile-brittle transition temperatures can be predicted at the same time with ultra-fine grain sizes. This work verified the microstructural evolution of a low carbon 0.15%C-1.39%Mn steel after an ice brine quenching from 1200 °C followed by warm rolling and intercritical annealing at 800 °C at different times. To compare the final microstructure, a first group of specimens were heated at temperatures in the range from 660 °C to 800 °C during 30 min and quenching in ice brine. After quenching from 1200 °C, a second group of specimens were laboratory warm rolled at 700 °C and annealed at 800 °C, for 1, 60, 120 and 180 min, following air cooling or quenching. The final microstructure of all specimens was analyzed by quantitative metallography using optical and scanning electron microscopy. The initial steel grain size condition was 120 µm. The specimens, after the whole processing cycle achieved a microstructure with ferrite grain size between 1 µm and 1.5 µm. The ferrite grain size values changed until 50% for samples warm rolled and heat treated between the first and last annealing time.
Documentos Relacionados
- Evaluation of hydrogen-Induced cracking resistance of the In625 laser coating system on a C-Mn steel substrate
- Caracterização da temperabilidade de um aço C-Mn microligado ao boro, através de dilatometria e curvas de transformações de fases por resfriamento contínuo.
- Effect of the Chemical Homogeneity of a Quenched and Tempered C-Mn Steel Pipe on the Mechanical Properties and Phase Transformations
- Soldagem FHPP - processo e metalurgia nas transformações das fases de um aço C-Mn
- Comportamento de Juntas Soldadas de Aço C-Mn Obtidas Pelo Processo GMAW-RE com Eletrodo Rotativo